761x VHF 764x UHF Conventional Mobile
VHF 146-174MHz 45 Watts Part No.
UHF 400-430, 450-470, 490-512MHz 35 Watts
Part No.
VHF 146-174MHz 45 Watts
UHF 400-430, 450-470, 470-490,or 490-512MHz
35 Watts
761x VHF 764x UHF CONVENTIONAL FM TWO-WAYRADIO
TABLE OF CONTENTS
2 INSTALLATION AND DISASSEMBLY
1 GENERAL INFORMATION
3 OPERATION
TABLE OF CONTENTS CONT’D
6 ADJUSTMENT PROCEDURE
7 PARTS LIST
5A VHF 7610 CIRCUIT DESCRIPTION
8SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS
LIST OF TABLES
LIST OF FIGURES
TABLE OF CONTENTS CONT’D
1.3 PRODUCT WARRANTY
1.6 ACCESSORIES
1.7 FACTORY CUSTOMER SERVICE
SECTION 1 GENERAL INFORMATION
Table 1-175xx Accessories
1.8 FACTORY RETURNS
Accessory
Toll-Free:800
1.9 REPLACEMENT PARTS
1.10 INTERNET HOME PAGE
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7610 VHF AND 7640 UHF MOBILE SPECIFICATIONS
GENERAL
NOTES
November
SECTION 2 INSTALLATION AND DISASSEMBLY
Figure 2-1Installation Components
2.2 TRANSCEIVER INSTALLATION
2.1 GENERAL
Figure 2-2Mounting Bracket Installation
2.2.2 INSTALLING MOUNTING BRACKET
2.2.3 INSTALLING MICROPHONE HANGER
2.3 POWER CABLE INSTALLATION
Changing 20-AmperePower Cable Fuses
2.4 USING AN EXTERNAL SPEAKER
2.5 ACCESSORY CABLE INSTALLATION
DB-9Pin
2.6 TRANSCEIVER DISASSEMBLY
Figure 2-5PC Board Screws
Figure 2-4Cover and Front Panel Removal
Figure 2-6Removing PC Board
Figure 2-7 2/5-ToneModule Installation
2.7 2-TONE/5-TONEMODULE INSTALLATION
Setting 5-ToneDeviation
25 kHz Channel Spacing - ±3.5 kHz
SECTION 3 OPERATION
3.1 FEATURES
Figure 3-17600 Front Panel
3.2 CONTROLS AND DISPLAY
3.3 BASIC OPERATION
Direct Selection - The F1-F4and
3.4 RECEIVING AND PLACING CALLS
3.5 PROGRAMMABLE FUNCTIONS
Table 3-1Option Key Programmable Functions
Function
Key Label
1.Press the TONE key and “TON--x”is displayed
3.6 CHANNEL SCAN
November
3.6.3 PRIORITY CHANNEL SAMPLING
Part No.
Figure 4-1Programming Setup
SECTION
PROGRAMMING
4.1 GENERAL
4.3 SPECIAL KEYS AND FUNCTIONS
4.2STARTING THE PROGRAM
4.4 MENU FLOW
Current - Prints the currently displayed data
4.4.7 SETUP MENU
Parameter
Description
Bank Select
Parameter
Auto Reset
Parameter
RF PWR
Lockout
Parameter
Description
Label
Label
Description
Parameter
Parameter
Table 4-3DTMF Autodial Screen Description
Parameter
Table 4-4Continuous Tone Screen Description
Table 4-5Scan Function Screen Description
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Part No.
Table 4-6 2-ToneCode Channel Screen Description
Description
Parameter
Parameter
Parameter
Beep
Table 4-7Common Screen Description
Table 4-8Expert Screen Description
Table 4-7Common Screen Description Continued
Parameter
4.5 UNIQUE PMR EUROPEAN SCREENS
Table 4-8Expert Screen Description Continued
Description
PROGRAMMING
Figure 4-2Memory Channel Screen PMR Models
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4-17
Part No.
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Part No.
4-18
SECTION 5A VHF 7610 CIRCUIT DESCRIPTION
5.1 VHF RECEIVER CIRCUIT
Figure 5-1Second IF System IC3 VHF
5.2 VHF TRANSMITTER CIRCUIT
Figure 5-3PLL Circuit VHF
5.2.5 APC CIRCUIT
5.3 VHF PLL CIRCUIT
5.3.1 PLL CIRCUIT
5.4 VHF IC PIN DESCRIPTIONS
Line
Description
Port
Port
SECTION 5B UHF 7640 CIRCUIT DESCRIPTION
5.5 UHF RECEIVER CIRCUIT
Figure 5-4Second IF System IC1 UHF
5.6 UHF TRANSMITTER CIRCUIT
Figure 5-6PLL Circuit UHF
5.7 UHF PLL CIRCUIT
5.7.3 UHF POWER SUPPLY
5.7.2 VCO CIRCUIT
5.7.4 UHF CPU IC1 PORT ALLOCATION
November
5.7.5 UHF I/O EXPANDER IC12 MAIN UNIT
5.7.6 UHF PORT EXPANDER IC13 MAIN UNIT
November
Part No.
SECTION 6 ADJUSTMENT PROCEDURE
Test Setup
Figure
6.1 GENERAL
Figure 6-3Test Cable Schematic
Figure 6-2Screen Display Example
6.1.2 TEST CHANNELS
6.1.3 TEST CABLE
Table 6-2UHF Test Frequencies
Table 6-1VHF Test Frequencies
ADJUST /X /Y
VHF ADJUSTMENTS
VHF ADJUSTMENTS
6.2 PRELIMINARY SETUP
6.3 PLL ADJUSTMENT VHF MODELS
VHF ADJUSTMENTS CONT’D
Figure 6-4VHF Adjustment Points
6.5 RECEIVER ADJUSTMENTS VHF MODELS
VHF ADJUSTMENTS CONT’D
Figure 6-5Beep Tone Level Adjustment
VHF ADJUSTMENTS CONT’D
6.6 PLL ADJUSTMENT UHF MODELS
UHF ADJUSTMENTS
6.7TRANSMITTER ADJUSTMENTS UHF MODELS
Figure 6-6UHF Adjustment Points
UHF ADJUSTMENTS CONT’D
6.7.4 DTCS WAVEFORM ADJUST
6.8 RECEIVER ADJUSTMENTS UHF MODELS
UHF ADJUSTMENTS CONT’D
SECTION 7 PARTS LIST
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VHF 7610 EXPLODED VIEW
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November
Part No.
←FOLDOUT VHF Exploded View
UHF 7640 EXPLODED VIEW
MAIN UNIT
VHF 7610 BLOCK DIAGRAM
FRONT UNIT
VHF 7610 Transistor Basing Diagrams
VHF 7610 Diode Basing Diagrams
FOLDOUT →
VHF 7610 MAIN BOARD BOTTOM VIEW
November
VHF 7610 MAIN BOARD TOP VIEW
Part No.
VHF 7610 MAIN BOARD SCHEMATIC
VHF MAIN UNIT
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UHF 7640 BLOCK DIAGRAM
Part No.
UHF 7640 MAIN BOARD BOTTOM VIEW
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UHF 7640 MAIN BOARD TOP VIEW
J4 T o O p tion al Un it
J2 T o S p kr
J5 T o O p t Ca ble
UHF 7640 MAIN BOARD SCHEMATIC
VHF/UHF FRONT UNIT BOARD TOP VIEW
VHF/UHF FRONT UNIT BOARD BOTTOM VIEW
VHF/UHF FRONT UNIT SCHEMATIC
FRONT UNIT
UHF 7640 Transistor Basing Diagrams
UHF 7640 Diode Basing Diagrams
TRANSISTORS AND FETS
• DIODES